Numerical investigation of convective transport in redox flow battery tanks: Using baffles to increase utilization

Yite Wang, Kyle C Smith

Research output: Contribution to journalArticle

Abstract

The efficient transmission of redox-active electrolyte between redox flow battery (RFB) tanks and their reactors is essential to utilizing charge capacity in grid-scale installations. Emerging redox-active electrolyte chemistries with high viscosity motivate operating RFBs near stoichiometric flow conditions, challenging the utilization of charge capacity due to convective transport limitations. In this work we use numerical simulation to resolve convective transport within RFB tanks that are free-flowing or configured with baffles by solving the laminar vorticity transport equation and transient species diffusion in two dimensions. Dead zones within free-flowing tanks are found to limit capacity utilization, while baffles are shown to enhance capacity utilization by eliminating dead zones for baffles that nearly span the tank. Utilization is maximized at a particular Péclet number, which depends on the effective length and throat of the serpentine flow path produced by baffles. These effects are shown to result from competition between transverse and longitudinal diffusive transport relative to the local flow.

Original languageEnglish (US)
Article number100840
JournalJournal of Energy Storage
Volume25
DOIs
StatePublished - Oct 2019

Fingerprint

Electrolytes
Vorticity
Viscosity
Computer simulation
Oxidation-Reduction
Flow batteries

Keywords

  • Convection
  • Mixing
  • Redox flow battery
  • Simulation
  • Tanks

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

@article{8aa0edd21b8e4452918180dfcbb20f86,
title = "Numerical investigation of convective transport in redox flow battery tanks: Using baffles to increase utilization",
abstract = "The efficient transmission of redox-active electrolyte between redox flow battery (RFB) tanks and their reactors is essential to utilizing charge capacity in grid-scale installations. Emerging redox-active electrolyte chemistries with high viscosity motivate operating RFBs near stoichiometric flow conditions, challenging the utilization of charge capacity due to convective transport limitations. In this work we use numerical simulation to resolve convective transport within RFB tanks that are free-flowing or configured with baffles by solving the laminar vorticity transport equation and transient species diffusion in two dimensions. Dead zones within free-flowing tanks are found to limit capacity utilization, while baffles are shown to enhance capacity utilization by eliminating dead zones for baffles that nearly span the tank. Utilization is maximized at a particular P{\'e}clet number, which depends on the effective length and throat of the serpentine flow path produced by baffles. These effects are shown to result from competition between transverse and longitudinal diffusive transport relative to the local flow.",
keywords = "Convection, Mixing, Redox flow battery, Simulation, Tanks",
author = "Yite Wang and Smith, {Kyle C}",
year = "2019",
month = "10",
doi = "10.1016/j.est.2019.100840",
language = "English (US)",
volume = "25",
journal = "Journal of Energy Storage",
issn = "2352-152X",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Numerical investigation of convective transport in redox flow battery tanks

T2 - Using baffles to increase utilization

AU - Wang, Yite

AU - Smith, Kyle C

PY - 2019/10

Y1 - 2019/10

N2 - The efficient transmission of redox-active electrolyte between redox flow battery (RFB) tanks and their reactors is essential to utilizing charge capacity in grid-scale installations. Emerging redox-active electrolyte chemistries with high viscosity motivate operating RFBs near stoichiometric flow conditions, challenging the utilization of charge capacity due to convective transport limitations. In this work we use numerical simulation to resolve convective transport within RFB tanks that are free-flowing or configured with baffles by solving the laminar vorticity transport equation and transient species diffusion in two dimensions. Dead zones within free-flowing tanks are found to limit capacity utilization, while baffles are shown to enhance capacity utilization by eliminating dead zones for baffles that nearly span the tank. Utilization is maximized at a particular Péclet number, which depends on the effective length and throat of the serpentine flow path produced by baffles. These effects are shown to result from competition between transverse and longitudinal diffusive transport relative to the local flow.

AB - The efficient transmission of redox-active electrolyte between redox flow battery (RFB) tanks and their reactors is essential to utilizing charge capacity in grid-scale installations. Emerging redox-active electrolyte chemistries with high viscosity motivate operating RFBs near stoichiometric flow conditions, challenging the utilization of charge capacity due to convective transport limitations. In this work we use numerical simulation to resolve convective transport within RFB tanks that are free-flowing or configured with baffles by solving the laminar vorticity transport equation and transient species diffusion in two dimensions. Dead zones within free-flowing tanks are found to limit capacity utilization, while baffles are shown to enhance capacity utilization by eliminating dead zones for baffles that nearly span the tank. Utilization is maximized at a particular Péclet number, which depends on the effective length and throat of the serpentine flow path produced by baffles. These effects are shown to result from competition between transverse and longitudinal diffusive transport relative to the local flow.

KW - Convection

KW - Mixing

KW - Redox flow battery

KW - Simulation

KW - Tanks

UR - http://www.scopus.com/inward/record.url?scp=85069600035&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85069600035&partnerID=8YFLogxK

U2 - 10.1016/j.est.2019.100840

DO - 10.1016/j.est.2019.100840

M3 - Article

AN - SCOPUS:85069600035

VL - 25

JO - Journal of Energy Storage

JF - Journal of Energy Storage

SN - 2352-152X

M1 - 100840

ER -